|Publication number||US5071314 A|
|Application number||US 07/525,748|
|Publication date||Dec 10, 1991|
|Filing date||May 18, 1990|
|Priority date||May 18, 1990|
|Publication number||07525748, 525748, US 5071314 A, US 5071314A, US-A-5071314, US5071314 A, US5071314A|
|Original Assignee||Solbjorn Jacobsen|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (5), Classifications (18), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The invention relates to a method of pumping up a fish catch from a cod end while the cod end remains in the water by means of a fish pump arranged on the cod end and by means of a pump hose being connected to the vessel, the fish pump being provided with a motor connected to an energy source on board the vessel, and a fish pump for carrying out the method.
Different methods of taking in a fish catch from a cod end are known.
In one method, the cod end is hauled from the water with the catch along a stern ramp on the vessel. If, however, the catch is large, it will be damaged by the compression during the towing.
In a second method, the so-called Norwegian method, the cod end is hauled alongside the vessel in the sea, after which a fish pump from the vessel is fitted on the cod end so that the catch can be pumped on board. The disadvantage of this method is that it can only be performed in relatively calm weather since the bag in rough weather would start to sink, because the buoyancy of the fish is impaired.
In order to overcome these shortcomings, it is known from EP-PS no. 73,769 to arrange a fish pump on a cod end and via a pump hose to pump up the catch while the cod end remains in the sea. For this purpose a radial pump is used having a gate valve fitted in the inlet channel of the pump for opening and closure of the influx of fish to the pump. Moreover, water inlet openings are provided in the channel so that the pump at the beginning when the valve blocks the admission of fish can pump clean sea water, after which the valve is opened and the pumping up of the catch can begin.
However, this known fish pump has the disadvantage that the admission of fish to the pump cannot be adjusted without risking to damage the fish when they pass the valve if the valve is not completely open. Add to this the condition that there is no opportunity for adjusting the water amount between each fish in that the water inlets are permanently open. This means that, in particular, large fish are damaged because they require a larger water volume relative to the fish volume if damage during pumping is to be avoided. Finally, the pump is a radial pump with an outflow direction being inexpedient since this may result in the pump hose being bent so sharply that the flow conditions are badly impaired resulting in possible damage to the fish.
It is the object of the invention to overcome these shortcomings and drawbacks of the known methods. This is effected by a throttle provided in the suction channel of the fish pump, said throttle being controlled from the vessel and being able to keep out the catch from the pump and to adjust the admission of the catch to the pump. Furthermore, when water can be supplied to the suction channel through inlet openings with adjustable throttles there can be adjustment of the mixture ratio between fish and water in the pump.
A hitherto unknown gentle pumping is hereby achieved in that it may be adapted to the composition and size of the catch and to the speed at which the vessel with its cod end moves in the sea. This permits fish for human consumption to be pumped in a large water volume thereby avoiding damage to the fish. In connection with trash fish, however, the pump capacity may be fully utilized in that the water volume can be reduced relative to the fish volume so that the emptying takes the shortest time possible.
By using a semi-axial pump, the outflow direction from the pump is turned backwards corresponding to the natural course of the pump hose, whereby sharp bending of the hose is avoided.
By designing the throttle as a double-action throttle body, moving synchronously in and out of the channel, the closure will take place from the outside towards the centre of the channel and thereby provide a gentle adjustment of the fish transportation.
Finally, it is expedient, if the throttle bodies open the water inlet openings in their closed position, because this causes the pump always to be started with clean sea water, upon which the gradual opening of the throttle will automatically cause a simultaneous reduction of the water admission which increases the fish pumping capacity.
In the following the invention will be described in closer detail with reference to the drawing, in which
FIG. 1 shows a cod end during emptying,
FIG. 2 shows the cod end with fish pump on the stern ramp of the vessel,
FIG. 3 is a side view of the fish pump proper,
FIG. 4 is a partial view of the throttle and the water inlet part,
FIG. 5 shows the throttle in its completely opened position, and
FIG. 6 is a sectional view of the pump housing and the pump wheel.
FIG. 1 shows an example of the operation of the method. In this example the vessel 1 is a trawler with a stern ramp and towing a cod end 7.
On board the vessel, the cod end 7, together with the trawl, is wound onto a winch 2 having a net drum. At its end the cod end is provided with a fish pump 8 having a basket portion g situated inside the cod end 7 and surrounded by the (not shown) fish catch. The pump part situated outside the cod end is connected with a hose 6 extending along the cod end to the vessel. Moreover, hydraulic pipes 5 extend between the hydraulic system 4 of the vessel and the hydraulic motor 12, (vide FIG. 6), which drives the pump, and the valve actuator 20, (vide FIG. 5), which operates the valve throttles.
Instead of a hydraulically operated pump, the pump may also be electrically driven, and the power supply to the motor 12 and the actuator 20 may be supplied through cables 5.
As shown in FIG. 2, the fish pump 8 is provided with a number of buoyancy balls 27 or the like so that the fish pump 8 will not weigh down the cod end during fishing and pumping.
The fish pump proper is shown in FIG. 3. It comprises a basket portion 9 which is inside the cod end 7 as indicated by the dotted line. Between this basket portion g and the fitting part 10 the net 7 is attached to a tapered fitting part by a lashing or the like.
As shown in FIG. 4 there is passage through the fitting part 10 so that the catch can be supplied to the suction channel 18 of the pump. In this channel 18 a throttle is arranged comprising the parts shown in FIG. 5, viz. two throttle parts 19 being pivotable around an axle 21, said throttle parts being interacting for instance by means of a generally known pinion so that if a hydraulic cylinder 20 or a similar actuator turns one throttle body 19 around the shaft 21 the other throttle body will move synchronously.
If the throttle bodies 19 are large or heavily weighted, an actuator 20 can be provided on each throttle body 19. This also increases their reliability should one actuator 20 stop working.
In this manner the channel 18 can be opened as shown in FIG. 5 and continuously can be shut in a brought-together position shown by dotted lines in FIG. 4, where the channel 18 is completely blocked. The curved throttle bodies are furthermore capable of withstanding a considerable pressure.
Near the throttle, the channel 18 includes through openings 16 and inlet channels 26, as shown in FIGS. 3 and 4, for entry of water 23 from outside the cod end into the channel 18. These openings in the channel wall are adjustable by means of sliding throttles 24 provided with a groove 25 in which a bolt is inserted so that the throttle 24 can be attached in any required position and thereby define the opening of the associated inlet channel 26.
Two or more channels 26 are, as shown in FIG. 4, self-adjusting in that the throttle bodies 19 in their closed position, will be entirely clear of the channel, which is thus completely open, thereby permitting a large water influx for instance when starting the pump. The channel and pump hose are hereby thoroughly scavenged for fish remnants before new fish are added to the pump.
By opening of the valve, the valve bodies 19 turn out to the positions shown and they will shut off the water flow to the suction channel 18 through the channels 26.
This makes it possible to adjust the water supply to the pump in advance by adjusting the sliding throttles 24 in accordance with the composition and character of the catch and thereby to adjust the ratio between the water volume and the pumped up fish volume.
As shown in FIG. 6, the suction channel 18 leads to the actual flow pump which is provided with a pump wheel 17 designed as a propeller blade and having a pump housing 13 in the form of a spiral housing. This gives a semi-axial outflow to the discharge nozzle 15 to which a hose 6 is attached.
The pump is driven by a hydraulic motor 12 which through hydraulic pipes 5, is supplied with the driving pressure required for operation of the pump.
On the outside, the fish pump 8 is provided with a number of protection bars 11 which, as shown in FIG. 3, may be padded in order to reduce the shock elements on the fish pump 8.
When the cod end 7 is hauled up to the ship while the catch remains in the sea, as shown in FIG. 1, the pump hose 6 and the hydraulic pipes 5 are connected on board the vessel to form interacting hoses or pipes, after which pumping can take place. When the pumping has been completed, the hoses are disconnected by being separated at the joints, and the hose ends are attached to the cod end. Then the cod end and trawl are returned to their fishing position with the throttle closed. This means that the fish pump is permanently fitted with hoses on the trawl/cod end.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US84237 *||Nov 17, 1868||Improvement in wind-wheels|
|US1762708 *||Jul 5, 1927||Jun 10, 1930||Harvey Allred Byron||Pump|
|US3116602 *||May 8, 1961||Jan 7, 1964||Charles J Dahle||Hydrojet power unit for boats with power reverse propulsion|
|US3936224 *||Jul 25, 1974||Feb 3, 1976||Nordquist Oscar M||Power turbine|
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|US4514139 *||Feb 17, 1983||Apr 30, 1985||Gurth Max Ira||Method and apparatus for pumping fragile articles|
|EP0073769A1 *||Feb 3, 1982||Mar 16, 1983||Solbjorn Jacobsen||Method for taking in the catch of a trawl by means of a fish pump.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6112699 *||Oct 21, 1996||Sep 5, 2000||Biozyme Systems, Inc.||Euphausiid harvesting and processing method and apparatus|
|US9759180 *||Oct 10, 2014||Sep 12, 2017||Richard Charles Russo||Waterfall apparatus|
|US20160102650 *||Oct 10, 2014||Apr 14, 2016||Richard Charles Russo||Waterfall Apparatus|
|WO2001090537A1 *||May 24, 2001||Nov 29, 2001||Ingersoll-Rand Energy Systems Corporation||Fish-friendly turbine|
|WO2017048134A1 *||Sep 8, 2016||Mar 23, 2017||The New Zealand Institute For Plant And Food Research Limited||A method of extracting aquatic animals from an apparatus|
|U.S. Classification||415/148, 415/166, 415/72|
|International Classification||F04D29/42, F04D3/02, F04D13/04, F04D15/00, A01K79/00|
|Cooperative Classification||F04D13/04, F04D15/0022, F04D29/4273, F04D3/02, A01K79/00|
|European Classification||F04D13/04, F04D3/02, A01K79/00, F04D29/42P2, F04D15/00B4|
|Jul 18, 1995||REMI||Maintenance fee reminder mailed|
|Dec 10, 1995||LAPS||Lapse for failure to pay maintenance fees|
|Feb 13, 1996||FP||Expired due to failure to pay maintenance fee|
Effective date: 19951213